MOSCOW — Vladimir Putin is seizing on mixed signals from the U.S. to quietly tighten Russia’s grip on two rebel regions of Ukraine, burying hopes for a European-brokered peace deal and relief from sanctions anytime soon.

While the Kremlin continues to publicly back the accord that Germany and France oversaw in 2015, Putin’s real strategy in Ukraine is to fully separate the two border areas known as the Donbas through incremental integration with Russia, three people close to the leadership in Moscow said. He has no plans to recognize or annex the territories, they said.

“A step has been taken toward detaching Donbas — there’s no doubt about that,” a senior lawmaker in the ruling United Russia party, Konstantin Zatulin, said by phone from Moscow. Like other officials, Zatulin blamed Ukraine for forcing Moscow’s hand through the blockade, an allegation Kiev rejects.

Zatulin’s assessment of the Kremlin’s plans was confirmed by Alexei Chesnakov, a former Kremlin staffer who now advises Putin’s administration on Ukraine policy, and a senior government official who asked not to be identified.

Earlier this year, Putin angered his Ukrainian counterpart, Petro Poroshenko, by signing a decree recognizing passports and other documents issued by the separatist governments in Luhansk and Donetsk, which have already declared the ruble their official currency. The Kremlin is also considering making it easier for the 2 million residents of the regions to become Russian citizens, which would complicate any attempt by Kiev to reassert control.

Moscow is implementing the so-called “Transnistria scenario,” according to the deputy head of Poroshenko’s administration, Kostiantyn Yelisieiev, referring to the breakaway region in the former Soviet republic of Moldova, which hosts Russian troops but has no citizenship agreements with Russia.

Russia supports a string of separatist regions in former Soviet republics, using them as leverage over pro-Western governments in what it considers to be its sphere of influence. In 2008, Russia sent troops into Georgia to secure two such areas that are now essentially Kremlin protectorates. Last month, Russia absorbed some of the militias there into its regular army.

“We don’t have peace for one reason: Russians are not interested in reaching peace,” Poroshenko said in London on Tuesday. “They are interested in exerting control.”

Putin’s moves in Ukraine pose a challenge to the U.S. and the European Union, which publicly support the 2015 Minsk accord that calls for Ukraine to regain control of the Donbas. A collapse of the deal would be a major blow to German Chancellor Angela Merkel, who’s spent a lot of political capital trying to end the worst violence Europe’s seen since the Balkan wars of the 1990s. The three-year conflict has killed 10,000 people and displaced 2 million more.

President Donald Trump’s administration, on the other hand, has sent mixed signals on its stance and even appears to be “totally uninterested” in the conflict, as one senior Russian diplomat put it. Trump has taken a tough line rhetorically, though he hasn’t made his position clear and the White House seems focused on issues it considers more pressing such as Syria and North Korea.